These choice of MI frequency is equally applicable to all the higher-order solutions as well. However, recent research has revealed that the role of \(\kappa _1\)  and \(\kappa _2\)  even for a second-order NLSE solution is far more complicated and plays a wider rôle in producing a whole new classes of solutions. A series of recent works has been devoted to this theme [1]}, [2]}, [3]}, [4]}.
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